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Monthly climate in Nikko, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Nikko features a humid subtropical climate (Cfa). Temperatures typically range between -2 °C (29 °F) and 23 °C (73 °F) through the year, but rarely can drop to -15 °C (5 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 2059 mm (81.1 inches) and receives 205 rainy days on the 1 mm (0.04 inches) threshold annually. Nikko enjoys an average of 2923 hours of sunshine throughout the year, and daylight varies from 9 hours 40 minutes to 14 hours 37 minutes per day.

Monthly average temperatures in Nikko, Japan

The warmest months in Nikko are July, August and September, with daily mean temperatures ranging from 18 to 23 °C (65 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (29 - 34 °F) throughout the day. On average each year, Nikko experiences 33 days above 25 °C (77.0 °F) and 107 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nikko. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum9°C
(49°F)		16°C
(61°F)		19°C
(67°F)		24°C
(76°F)		28°C
(82°F)		27°C
(81°F)		31°C
(88°F)		32°C
(89°F)		29°C
(84°F)		25°C
(78°F)		18°C
(64°F)		16°C
(61°F)
Mean maximum7°C
(45°F)		11°C
(51°F)		16°C
(61°F)		21°C
(69°F)		26°C
(79°F)		24°C
(75°F)		28°C
(83°F)		30°C
(86°F)		27°C
(80°F)		23°C
(74°F)		17°C
(62°F)		11°C
(53°F)
Average high2°C
(35°F)		3°C
(38°F)		8°C
(47°F)		13°C
(55°F)		18°C
(65°F)		21°C
(69°F)		24°C
(76°F)		26°C
(79°F)		21°C
(71°F)		16°C
(61°F)		11°C
(52°F)		5°C
(41°F)
Daily mean-2°C
(29°F)		-1°C
(30°F)		4°C
(39°F)		8°C
(47°F)		14°C
(57°F)		17°C
(63°F)		21°C
(70°F)		23°C
(73°F)		18°C
(65°F)		13°C
(55°F)		7°C
(44°F)		1°C
(34°F)
Average low-5°C
(24°F)		-5°C
(24°F)		-1°C
(31°F)		3°C
(38°F)		9°C
(49°F)		14°C
(57°F)		18°C
(65°F)		20°C
(68°F)		15°C
(60°F)		10°C
(49°F)		3°C
(37°F)		-2°C
(28°F)
Mean minimum-10°C
(15°F)		-11°C
(13°F)		-7°C
(20°F)		-3°C
(27°F)		2°C
(36°F)		9°C
(48°F)		15°C
(59°F)		15°C
(59°F)		10°C
(50°F)		3°C
(38°F)		-3°C
(27°F)		-7°C
(20°F)
Minimum-12°C
(11°F)		-15°C
(5°F)		-11°C
(13°F)		-4°C
(24°F)		1°C
(34°F)		7°C
(44°F)		14°C
(57°F)		10°C
(50°F)		6°C
(43°F)		0°C
(33°F)		-4°C
(25°F)		-11°C
(12°F)

Compare climate in Nikko with other places

Compare temperature, precipitation, sunshine, UV index in Nikko, Japan with other places around the world.

Monthly average precipitation in Nikko, Japan

Nikko usually has the most precipitation in July, August and October, with an average of 24 rainy days and 299 mm (11.8 inches) of precipitation per month. The driest months in Nikko are January, February and November. On average, 56 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nikko. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)55 (2.2)53 (2.1)142 (5.6)143 (5.6)176 (6.9)225 (8.8)345 (13.6)273 (10.7)239 (9.4)279 (11.0)61 (2.4)68 (2.7)
Average precipitation days (≥ 1 mm)11111415182127262519711

Monthly sunshine hours in Nikko, Japan

The sunniest months in Nikko are April, May and August, when the sun shines an average of 9 hours 5 minutes a day. Least sunny months in Nikko: January, October and December receive an average of 6 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nikko. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours184232265277284270241274230209228224
Mean daily daylight hours9h 56m10h 49m11h 57m13h 8m14h 7m14h 37m14h 22m13h 30m12h 23m11h 13m10h 12m9h 40m

Solar UV radiation in Nikko, Japan

Nikko experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Nikko UV Index data.

Average daily maximum UV levels by month for Nikko. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)46891011111110753